\( 1 \mathrm{~cm} \) of main scale of a vernier callipers is divided into 10 divisions. The leas...

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\( 1 \mathrm{~cm} \) of main scale of a vernier callipers is divided into 10 divisions. The least count of the callipers is \( 0.005 \mathrm{~cm} \), then the vernier scale must have
(a) 10 divisions
(b) 20 divisions
(c) 25 divisions
(d) 50 divisions
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